Q: Is 865,421 a Prime Number?
A: No, 865,421 is not a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 865421 can be evenly divided by 1 23 191 197 4,393 4,531 37,627 and 865,421, with no remainder.
Since 865,421 cannot be divided by just 1 and 865,421, it is not a prime number.